To run,or not to run???
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To run,or not to run???

  1. #1
    Senior Member watergun4u's Avatar
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    Default To run,or not to run???

    Have any one used a dampener that just slide right on,and pulled right off with your hands?????? Not sure on running this, could it be the dampener itself? Checked for cracks in the dampener and found none, all looks good! What do you all think??
    Thanks

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    Quote Originally Posted by watergun4u View Post
    Have any one used a dampener that just slide right on,and pulled right off with your hands?????? Not sure on running this, could it be the dampener itself? Checked for cracks in the dampener and found none, all looks good! What do you all think??
    Thanks
    check the keyway in the dampner...it could have been cut for a full length 1/4" square key ...if this is the case, u will have to cut ur crank to match or u cant use it...sounds to me like it could have come off of a blower motor!...they used to cut them (dampner & crank) years ago (probably still do) to keep from breaking the stock key ...also... good idea on high HP apps!...just my .02 cents

    FastRat

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    Senior Member watergun4u's Avatar
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    Quote Originally Posted by FastRat View Post
    check the keyway in the dampner...it could have been cut for a full length 1/4" square key ...if this is the case, u will have to cut ur crank to match or u cant use it...sounds to me like it could have come off of a blower motor!...they used to cut them (dampner & crank) years ago (probably still do) to keep from breaking the stock key ...also... good idea on high HP apps!...just my .02 cents

    FastRat
    Thanks FastRat,, The dampner looks to be uncut,as to the key way, but it also looks like someone might have bored out the inside of the dampner,so as to have it slide on eazy to make taking it off eazy and quick! I talked to a few people who say they use to do that on some race app's to make it faster to tear down,if need be in the pits! I am not so sure!!!! Just got this motor all put back together and really don't want to have to pull it all back down!, But will be will be its a new motor and I don't want to have any problems, especially have that come off at speed!

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    Quote Originally Posted by watergun4u View Post
    Thanks FastRat,, The dampner looks to be uncut,as to the key way, but it also looks like someone might have bored out the inside of the dampner,so as to have it slide on eazy to make taking it off eazy and quick! I talked to a few people who say they use to do that on some race app's to make it faster to tear down,if need be in the pits! I am not so sure!!!! Just got this motor all put back together and really don't want to have to pull it all back down!, But will be will be its a new motor and I don't want to have any problems, especially have that come off at speed!
    i have never heard of that...i have drag raced back in the day & never seen such a mod...we used to run a Chrysler crank snout on our SBC dragster for strength & bore the balancer out to fit & cut a 1/4" full keyway in both, but, that was a nitro inj motor & spun to 9000 in the lites...that was also after snapping the stock keys a # of times!!! ...i personally would not run it, especially since its a new motor & u have alot of hard work in it ...someone could get seriously hurt if it left go at high speed!...get the correct one for safety & peace of mind reasons!...just sayin' my .02 cents

    FastRat

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    Default Bbc??

    Is this a BBC? Some Mopars/Pontiacs were a slide on/off.....It can't come off unless it breaks the bolt, but it may not do it's job of vibration dampening.....SOME aftermarket cranks are a little bigger, (.002/.003), on the snout and require an aftermarket flange/dampener. It is possible that balancer was used on one of the larger cranks and has been honed out a bit. On another note, we don't run a balancer on the "snout driven" circle boat, just the drive flange.....So you should be OK as far as vibration dampening, but use a new bolt/washer to hold it on and keep an eye on it....Ray
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    Senior Member lbhsbz's Avatar
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    My general rule is that if something looks strange to the point that I'm questioning whether or not it would be OK to use it, the answer is no.

    The balancer should fit tight. The bolt is just an "extra security" device. Many of the early SBCs just used press fit balancers, no bolts. I wouldn't rely on a single 1/2-20 or 7/16-20 bolt (can't remember which the BBC uses) to hold the balancer on....it most likely won't end well.

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    Quote Originally Posted by lbhsbz View Post
    My general rule is that if something looks strange to the point that I'm questioning whether or not it would be OK to use it, the answer is no.

    The balancer should fit tight. The bolt is just an "extra security" device. Many of the early SBCs just used press fit balancers, no bolts. I wouldn't rely on a single 1/2-20 or 7/16-20 bolt (can't remember which the BBC uses) to hold the balancer on....it most likely won't end well.
    If it doesn't fit tight, it may damage your crank . But if you do use it ,use locktight on the 1/2" bolt. Install with 1/2" impact

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